public class EX4_20 {
	public static void main(String args[]) {
		char a[] = {'a','b','c','D','E','F'};
		for(int i =0;i<a.length;i++){
			if(Character.isLowerCase(a[i]))
				a[i] = Character.toUpperCase(a[i]);
			else if (Character.isUpperCase(a[i]))
				a[i] = Character.toLowerCase(a[i]);
		}
		for(int i =0;i<a.length;i++)
		System.out.print(" "+a[i]);
	}
}
